
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        while (sc.hasNext()){
            long a= sc.nextLong();
            long b= sc.nextLong();
            long c= sc.nextLong();
            if ((a+b>c)&&(a+c>b)&&(b+c>a)){
                System.out.println("Yes");
            }
            else
                System.out.println("No");

        }
    }
}
